Preparation and characterization of SA/AKP composite fibers by centrifugal wet continuous spinning

In wet spinning, balancing the conflict between fiber densities and diffusion resistance is essential to obtain fibers with low differences in radial structure, high densities, and excellent properties. Different from the conventional centrifugal spinning, this paper utilizes the combined effect of friction and winding tension of the rotating coagulation bath to obtain continuous sodium alginate/Antarctic krill protein composite fibers by stretching the polymer ejected from the spinneret. The curing rate constant (Sr =0.1543 mm/s1/2) and the fiber solidification model were first obtained by monitoring the draft solidification process. Then the principle of the effect of rotational speed on the internal radial structure of the fibers was analyzed using SEM, AFM, FTIR, XRD, orientation, and mechanical property tests. Continuous sodium alginate/ Antarctic krill protein composite fibers with small differences in radial structure, high orientation (0.94266) and high modulus (44.14 cN/dtex), and high strength (2.0 cN/dtex) were obtained at 300 rpm. Finally, thermodynamic studies also find that the increase in rotational speed improves the fibers' thermal stability. The process provides reference parameters for obtaining composite fibers with balanced radial structure differences, high orientation, high modulus, and high strength.